Grainger do stock a good numbers of their product; however, too pricy
Amazon, Sears, Lowes and Home Depot do not stock much of them ... just some basic tools in general. I am an electrician and needs some specialized tools that cost hundreds. I know most supply houses carry them but often pricy. That is one of reason why I am looking for an ONLINE supplier that carry a decent numbers of their product as some of them usually have good prices.
If you're not in a hurry and you're very careful you can acquire Greenlee from ebay. There is a ton of new stuff listed every day, most of it overpriced. Occasionally, you can get a good deal using something like esnipe.com but you have to be patient. I just setup a saved search and get it via E-Mail every day. When I see something I put in a proxy bid using esnipe.com and forget about it.